Clivia Root Rot and Methods for Preventing and Controlling Edible Fungus Diseases and Pests

Clivia root rot can occur in all four seasons, but it mostly occurs in summer, mainly caused by the specific environment of high temperature and high humidity and by the grower's lack of care knowledge. For example, some people, for the sake of appearance, grow clivia in porcelain pots, plastic pots, or purple clay pots, which have poor air and water permeability. After watering in summer, because the pots have poor permeability and air circulation is difficult, the roots' respiration is blocked, causing root rot; some, although they plant clivia in clay pots, fear that in summer it lacks water and fertilizer, so they water as soon as the pot's surface soil looks dry (while the soil in the pot is actually still moist), and they often apply thick fertilizer. When root respiration is suffocated, thick fertilizer burns the roots, and certain harmful bacteria multiply quickly in summer, root rot is caused.

For clivia, whether in the vegetative growth stage (from the seedling stage to before flowering) or the reproductive growth stage (after flowering begins), the suitable growth temperature is 5-25°C. Generally, because family cultivation of clivia lacks the necessary equipment and conditions, one should proceed from the actual situation. In the hot and humid summer, in addition to taking measures such as shading, ventilation, and cooling, one should, from the perspective of controlling its growth (keeping the plant in a dormant or semi-dormant state, which is beneficial to its growth and development in other seasons), strengthen root care in summer. The methods:

First, use clay pots to grow clivia,

Second, in summer do not apply fertilizer or apply only a small amount of dilute liquid fertilizer,

Third, in summer control watering, and insist on never watering unless the soil is completely dry. To prevent excessive water in summer from suffocating the roots, you can use a large wooden box filled with wet sawdust and bury the flower pot in it (do not water inside the pot), then check frequently, and when the sawdust is dry, supplement by spraying water.

If root rot occurs accidentally, rescue it quickly. First, knock the clivia with root rot out of the pot, remove the soil, cut off the rotted roots, wash the roots with clean water, then apply a potassium permanganate aqueous solution to the rotted root areas, then wrap all the leaves with white paper, exposing the roots, with the roots facing the sun, and sun them in sunlight for half an hour, using ultraviolet rays to kill pathogens. After the above treatment, if only a few roots of the diseased plant have rotted, it can be directly planted in disinfected nutrient soil, watered less for the first half month, and growth can recover in one and a half months; if more than half or all of the roots of the diseased plant have rotted, it should be planted in a pot filled with fine sand and placed in a cool place to sprout new roots. After about two months, when new roots have grown, replace the nutrient soil, and then normal management can be carried out.